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Assuming this is just a follow on to your previous question about vegetation indices, I would recommend not using the Vegetation Index Calculator. It's quite cumbersome, and (as far as I can tell) more relevant for hyperspectral imagery where you want ENVI to automatically choose the correct band from an image cube based on that wavelengths defined in the header.

Instead, I would suggest using the Band Math tool. If you're doing NDVI or EVI, you can just type in the formula here, choose the bands, and ENVI will run the calculation. You will want to have your EVI formula be something like this:

2.5 * ((B2-B1) / (B2 + 6 * B1 - 7.5 * B3 + 1))

Where B1 = red, B2 = NIR, and B3 = blue. Note that you may need to play around with the float() command depending on the data type of the NAIP data. Otherwise, ENVI will incur some serious rounding errors.